in the late 70s, 88% of kids had blood lead levels of 10 ug/dL or higher (bc of leaded gasoline, paint, plumbing)
now the average is less than 1 ug/dL, 3.5 ug/dL is considered high, and researchers are finding lost IQ even at 1-2 ug/dL.
Like most of our parents could have lost 6+ IQ points
